/Engine/Source/Runtime/UMG/Public/Animation/MovieSceneWidgetMaterialSystem.h
struct FPreAnimatedWidgetMaterialSwitcherStorage : public [UE::MovieScene::TPreAnimatedStateStorage< TPreAnimatedMaterialTraits< FWidgetMaterialAccessor, UObject *, FWidgetMaterialHandle > >](API\Runtime\MovieScene\Evaluation\PreAnimatedState\TPreAnimatedStateStorage)